Each every single counrty in this world had the chance to close the boarder early. They all failed. And things like that should be the solution now? Seriously? Even with the wristband people transfer the virus. So it's totaly useless.
Closing border refers to closing it for regular people.
The "big switch" was 14to 15 of March. The MSN here ran a fake story about Trump wanting to buy some German pharma company (all large newspapers retracted the story around March 17), but it was enough to get people sufficiently distracted to completely change their previous policy.
It was pretty interesting to watch how it was orchestered.